2009 NISSAN LATIO door lock

115, " Trouble Diagnosis Procedure " .
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check system s shown in the “Diagnosis/procedure” column in this
order.
Conditions of Vehicle (Operating Conditions)
• “LOCK/UNLOCK BY I-KEY” is ON when setting on CONSULT-III.
• Mechanical key is out of ignition switch.
• Ignition switch is not depressed.
• All doors are closed.
• Intelligent Key is registered.
REMOTE KEYLESS ENTRY FUNCTION MALFUNCTION
Symptom Diagnosis/service procedure Reference page
All function of Intelligent Key system dose not
operate. 1. Check Intelligent Key unit power supply and ground
circuit. BL-126 2. Check Intelligent Key battery inspection.
BL-158 3. Replace Intelligent Key unit.
BL-158Symptom Diagnosis/service procedure Reference page
Door lock/unlock does not operate by all request
switches. 1. Check door switch (hatchback).
BL-131 2. Check door switch (sedan).
BL-134 3. Check key switch.
BL-127 4. Check ignition knob switch.
BL-129 5. Replace Intelligent Key unit.
BL-158Door lock/unlock does not operate by request
switch (driver side). 1. Check door request switch (driver side).
BL-135 2. Check outside key antenna (driver side).
BL-143 3. Replace Intelligent Key unit.
BL-158Door lock/unlock does not operate by request
switch (passenger side). 1. Check door request switch (passenger side).
BL-135 2. Check outside key antenna (passenger side).
BL-143 3. Replace Intelligent Key unit.
BL-158Door lock/unlock does not operate by back door
request switch (hatchback). 1. Check back door request switch.
BL-137 2. Check outside key antenna (rear bumper).
BL-144 3. Replace Intelligent Key unit.
BL-158Door lock/unlock does not operate by trunk
opener request switch (sedan). 1. Check trunk opener request switch.
BL-138 2. Check outside key antenna (rear bumper).
BL-144 3. Replace Intelligent Key unit.
BL-158Auto lock function does not operate.
1. Check “AUTO RELOCK TI
MER” setting in “WORK
SUPPORT”. BL-117 2. Replace Intelligent Key unit.
BL-158Key reminder function does not operate.
1. Check door switch (hatchback).
BL-131 2. Check door switch (sedan).
BL-134 3. Check inside key antenna.
BL-146 4. Check unlock sensor.
BL-140 5. Check Intelligent Key battery.
BL-158 6. Replace Intelligent Key unit.
BL-158

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NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-115, " Trouble Diagnosis Procedure " .
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check syst ems shown in the “Diagnosis/service procedure” column
in this order.
Conditions of Vehicle (Operating Conditions) • Ignition switch is not depressed.
• All doors are closed.
HAZARD AND BUZZER REMINDER FUNCTION MALFUNCTION NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-115, " Trouble Diagnosis Procedure " .
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check syst ems shown in the “Diagnosis/service procedure” column
in this order.
Conditions of Vehicle (Operating Conditions) • Ignition switch is not depressed.
• All doors are closed. Symptom Diagnosis/service procedure
Reference
page
All of the remote keyless entry functions do
not operate. 1. Check Intelligent Key unit power supply and ground circuit.
BL-1262. Check key switch (BCM input).
BL-1283. Check Intelligent Key battery.
BL-1584. Remote Keyless Entry function inspection.
BL-1585. Replace Intelligent Key unit.
BL-158Auto lock function does not operate.
1. Check “AUTO RELOCK TIMER”
setting in “WORK SUPPORT”. BL-117 2. Replace Intelligent Key unit.
BL-158Key reminder function does not operate.
1. Check door switch (hatchback).
BL-1312. Check door switch (sedan).
BL-1343. Check inside key antenna.
BL-1464. Check unlock sensor.
BL-1405. Check Intelligent Key battery.
BL-1586. Replace Intelligent Key unit.
BL-158Panic alarm function does not operate.
1. Check “PANIC ALARM DELAY” setting in “WORK SUPPORT”.
BL-1172. Check Intelligent Key battery inspection.
BL-1583. Check horn function.
BL-1574. Check headlamp function.
BL-1575. Check key switch.
BL-1276. Check ignition knob switch.
BL-1297. Replace Intelligent Key unit.
BL-158Symptom Diagnosis/service procedure Reference page
Hazard reminder does not operate by request
switch.
(Buzzer reminder operate). 1. Check “HAZARD ANSWER BACK” setting in “WORK
SUPPORT”. BL-1172. Check hazard function with hazard switch.
BL-1563. Replace Intelligent Key unit.
BL-158

115, " Trouble Diagnosis Procedure " .
• Make sure that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following “symptoms” are detected, check syst ems shown in the “Diagnosis/service procedure” column
in this order.
Conditions of Vehicle (Operating Conditions)
Warning chime/buzzer functions operating condition is ex tremely complicated, during operating confirmations,
reconfirm the list above twice in order to ensure proper operation. Buzzer reminder does
not operate by request
switch.
(Hazard reminder oper-
ates). Intelligent Key
warning buzzer
does not operate. 1. Check “ANSER BACK WITH I-KEY LOCK” or “ANSER
BACK WITH I-KEY UNLOCK” setting in “WORK SUP-
PORT”. BL-1172. Check Intelligent Key warning buzzer(s).
BL-1423. Replace Intelligent Key unit.
BL-158Hazard reminder does not operate by Intelli-
gent Key (door lock/unlock button).
(Buzzer reminder operates properly). 1. Check “HAZARD ANSWER BACK” setting in “WORK
SUPPORT”. BL-1172. Check hazard function with hazard switch.
BL-1563. Replace Intelligent Key.
BL-158Buzzer reminder does
not operate by Intelligent
Key (door lock/unlock
button).
(Hazard reminder oper-
ates). Intelligent Key
warning buzzer
does not operate. 1. Check “HORN WITH KEYLESS LOCK” setting in “WORK
SUPPORT”. BL-1172. Check Intelligent Key warning buzzer(s).
BL-1423. Replace Intelligent Key unit.
BL-158Symptom Diagnosis/service procedure Reference page
Symptom Diagnosis/service procedure Reference page
Ignition switch warning chime does not oper-
ate. 1. Check ignition knob switch.
BL-1292. Check door switch (hatchback).
BL-1313. Check door switch (sedan).
BL-1344. Check key switch.
BL-1275. Check Intelligent Key warning chime.
BL-1566. Replace Intelligent Key unit.
BL-158Ignition key warning chime does not operate.
(When mechanical key used). 1. Check key switch (Intelligent Key unit input).
BL-1272. Check key switch (BCM input).
BL-1283. Check door switch (hatchback).
BL-1314. Check door switch (sedan).
BL-1345. Check Intelligent Key warning chime.
BL-1566. Replace Intelligent Key unit.
BL-158OFF position warning chime (For internal)
does not operate. 1. Check ignition switch position.
BL-1502. Check ignition knob switch.
BL-1293. Check key switch.
BL-1274. Check combination meter warning chime.
BL-1565. Replace Intelligent Key unit.
BL-158

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WARNING LAMP FUNCTION MALFUNCTION
NOTE:
• Before performing the diagnosis in the following table, check “Trouble Diagnosis Procedure”. Refer to BL-115, " Trouble Diagnosis Procedure " .
• If the following “symptoms” are detected, check syst ems shown in the “Diagnosis/service procedure” column
in this order.
OFF position warning
chime/buzzer (for ex-
ternal) does not oper-
ate. Both Intelligent Key
warning chime and
buzzer do not oper-
ate. 1. Check ignition switch position.
BL-1502. Check ignition knob switch.
BL-1293. Check key switch.
BL-1274. Check Intelligent Key warning chime.
BL-1565. Check Intelligent Ke
y warning buzzer(s). BL-142 6. Replace Intelligent Key unit.
BL-158Intelligent Key warn-
ing buzzer does not
operate. Check Intelligent Key warning buzzer(s).
BL-142Take away warning
chime/buzzer (door
open to close) does
not operate. Both Intelligent Key
warning chime and
buzzer do not oper-
ate. 1. Check door switch (hatchback).
BL-1312. Check door switch (sedan).
BL-1343. Check inside key antenna.
BL-1464. Check key switch.
BL-1275. Check Intelligent Key warning chime.
BL-1426. Check Intelligent Ke
y warning buzzer(s). BL-142 7. Replace Intelligent Key unit.
BL-158Intelligent Key warn-
ing buzzer does not
operate. Check Intelligent Key warning buzzer(s).
BL-142Take away warning chime (through window)
does not operate. 1.
Check “TAKE OUT FROM WINDOW WARN” setting in
“WORK SUPPORT”. BL-1172. Check inside key antenna.
BL-1463. Check key switch.
BL-1274. Check Intelligent Key battery.
BL-1585. Check Intelligent Key warning chime.
BL-1566. Replace Intelligent Key unit.
BL-158Door lock operation warning buzzer does not
operate. 1. Check door switch (hatchback).
BL-1312. Check door switch (sedan).
BL-1343. Check ignition knob switch.
BL-1294. Check door request switch.
BL-1355. Check back door request switch (hatchback).
BL-1376. Check trunk opener request switch (sedan).
BL-1387. Check outside key antenna (driver side and passenger side).
BL-1438. Check outside key antenna (rear bumper).
BL-1449. Check inside key antenna.
BL-14610. Check Intelligent Key warning buzzer(s).
BL-14211. Replace Intelligent Key unit.
BL-158One warning buzzer does not operate (se-
dan). Check Intelligent Key warning buzzer(s).
BL-142Symptom Diagnosis/service procedure Reference page

BL-132< SERVICE INFORMATION >
INTELLIGENT KEY SYSTEM
OK or NG OK >> Door switch circuit is OK.
NG >> GO TO 2 2.
CHECK DOOR SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect door switch and BCM.
3. Check continuity between door switch connector (B) B8 (front LH), B108 (front RH) terminal 2 or (C) B6
(rear LH), B116 (rear RH) terminal 1 or back door lock assembly connector (D) D405 terminal 3 and BCM
connectors (A) M18, M19 terminals 12, 13, 43, 47 and 48.
4. Check continuity between door switch connector (B) B8 (front
LH), B108 (front RH) terminal 2 or (C) B6 (rear LH), B116 (rear
RH) terminal 1 or back door lock assembly connector (D) D405
terminal 3 and ground.
OK or NG OK >> GO TO 3
NG >> Repair or replace harness. 3.
CHECK DOOR SWITCHES
FRONT AND REAR DOORS Connector Item
Terminals
ConditionVoltage (V)
(Approx.)
( + ) ( – )
M18 Front door
switch RH 12
Ground Open
↓
Closed 0
↓
Battery voltage
Rear door
switch RH 13
M19 Back door
switch 43
Front door switch LH 47
Rear door switch LH 48 LIIA1041E
1 - 13 : Continuity should exist.
1 - 48 : Continuity should exist.
2 - 12 : Continuity should exist.
2 - 47 : Continuity should exist.
3 - 43 : Continuity should exist.
1 - Ground : Continuity should not exist.
2 - Ground : Continuity should not exist.
3 - Ground : Continuity should not exist. WIIA1244E

INTELLIGENT KEY SYSTEM
BL-133
< SERVICE INFORMATION >
C
D E
F
G H
J
K L
M A
B BL
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Check continuity between front door switch terminal 2 or rear door
switch terminal 1 and exposed metal of switch while pressing and
releasing switch.
BACK DOOR
Check continuity between back door lock assembly connector (back
door switch) terminals 3 and 4 while pressing (closing back door)
and releasing (opening back door) switch.
OK or NG OK1 >> (Front and rear doors) Switch circuit is OK.
OK2 >> (Back door) GO TO 4
NG >> Replace door switch. 4.
CHECK BACK DOOR SWITCH GROUND
Check continuity between back door lock assembly connector D405
terminal 4 and ground.
OK or NG OK >> GO TO 5
NG >> Repair or replace harness. 5.
CHECK BACK DOOR SWITCH SIGNAL FOR SHORT
1. Disconnect Intelligent Key unit.
2. Check continuity between BCM connector M18 terminal 30 and ground.
OK or NG OK >> Back door switch circuit is OK.
NG >> Repair or replace harness. Door switch is released : Continuity should exist.
Door switch is pushed : Continuity should not exist. PIIB6899E
When back door is open : Continuity should exist.
When back door is closed : Co ntinuity should not exist. WIIA1245E
4 - Ground : Continuity should exist.
WIIA1246E
30 - Ground : Continuity should not exist.
WIIA1299E

BL-140< SERVICE INFORMATION >
INTELLIGENT KEY SYSTEM4.
CHECK TRUNK OPENER REQU EST SWITCH GROUND CIRCUIT
Check continuity between trunk opener request switch connector B129 terminal 2 and ground.
OK or NG OK >> GO TO 5
NG >> Repair or replace trunk opener request switch ground
circuit. 5.
CHECK INTELLIGENT KEY UNIT OUTPUT SIGNAL
1. Connect Intelligent Key unit connector.
2. Check voltage between Intelligent Key unit connector M52 terminal 29 and ground.
OK or NG OK >> Check the condition of harness and connector.
NG >> Replace Intelligent Key unit. Refer to BL-158, " Removal
and Installation of Intelligent Key Unit " .
Unlock Sensor Check INFOID:00000000043050551.
CHECK UNLOCK SENSOR INPUT SIGNAL
Check voltage between Intelligent Key unit connector and ground.
OK or NG OK >> Unlock sensor circuit is OK.
NG >> GO TO 2 2.
CHECK UNLOCK SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and front door lock actuator LH (door unlock sensor) connector.
3. Check continuity between Intelligent Key unit connec tor (A) terminal 28 and front door lock actuator LH
(door unlock sensor) connector (B) terminal 4.
Trunk opener request
switch connector Terminal
GroundContinuity
B129 2 Yes PIIB6337E
Terminals
Voltage (V)(Approx.)
(+)
(–)
Intelligent Key unit
connector Terminal
M52 29 Ground 5 PIIB6617E
Terminals
Front door
lock
(driver side) condition Voltage (V)
(Approx.)
(+)
(–)
Intelligent Key
unit connector Terminal
M52 28 Ground Locked 5
Unlocked 0 PIIB6638E

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4. Check continuity between Intelligent Key unit connector and
ground.
OK or NG OK >> GO TO 3
NG >> Repair or replace harness between Intelligent Key unit and front door lock actuator LH (door
unlock sensor). OK >> GO TO 4
NG >> Replace unlock sensor. OK >> GO TO 5
NG >> Repair or replace harness.